On Tue, 09 Oct 2018 08:01:01 +0000, Eugen Block wrote:
So it's still unclear why nova downloaded a raw glance image to the
local filesystem during the previous attempt.
I always knew that with Ceph as backend it's recommended to use raw
images but I always assumed the "disk-format" was not more than a
display option. Well, now I know that, but this still doesn't explain
the downloaded base image.
If anyone has an idea how to reproduce such behavior or an
explanation, I'd love to hear it.
Right, in order to get the ceph CoW behavior, you must use RAW glance
image format [1]. You also need to have created the image as 'raw'
before you upload to glance (qemu-img info should show the file format
as 'raw').
If you have done this, then you shouldn't see any image downloaded to
the local filesystem. Is it possible that your image did not have file
format 'raw' before you uploaded it to glance?
Cheers,
-melanie
[1] http://docs.ceph.com/docs/master/rbd/rbd-openstack
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